When installing a Fusionlnsight HD cluster in safe mode, which components must be installed? (Multiple choice)

What are the following main functions of Fusioninsight Manager?

In the HDFS mechanism, NameNodet is responsible for managing metadat
a. Each read request on the Clienty side needs to read metadata information from the metadata disk of NameNode, so as to obtain the location of the read file in DataNodel.

SoIrCloud mode is a cluster mode. In this mode, the Solr server strongly depends on which of the following services?

kafka Distributed message delivery is based on reliable message queues. Which of the following two main message delivery patterns are included?